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Newswise — The answer to the question of whose curveball breaks harder -- that of the Yankees' A.J. Burnett or the Phillies' Cole Hamels -- may be neither.

Zhong-Lin Lu, a professor of cognitive neuroscience at USC, along with USC alumni Emily Knight and Robert Ennis and Arthur Shapiro, associate professor of psychology at American University, developed a simple visual demo that suggests a curveball's break is, at least in part, a trick of the eye.

Their demo won the Best Visual Illusion of the Year prize at the Vision Sciences meeting earlier this year.